|
132. Think of it this way: the first person shakes hands with
11 people, the second person also shakes hands with 11 people, but you only
count 10, because the hand shake with the first person was already counted. Then
add 9 for the third person, 8 for the fourth, & so on. 66 hand shakes took
place before & after the meeting, for a total of 132. |